Use this workshop calculation to turn measured dimensions and the selected construction convention into a cut, spacing, fit, or material-planning value.

Cutting speed (m/min)

Required number input.

Tool diameter (mm)

Required number input.

Calculate the router spindle speed in revolutions per minute from cutting speed and tool diameter. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Spindle speed (1/min)

The resulting spindle speed returned as a number.

• Nominal dimensions, kerf, moisture movement, hardware clearances, wall squareness, and manufacturer instructions can change the required shop dimension. Measure the actual assembly and test critical joints on scrap before cutting finished material.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Complement the calculated dimension with a physical story stick, dry fit, or full-size layout. Follow the hardware, coating, adhesive, or machine manufacturer's limits where they differ from a rule of thumb.

• Lathe Speed RPM

  Convert target surface cutting speed and turning diameter into kinematic spindle RPM; this is not a safe-speed recommendation.

• Countersink Depth

  Calculate conical countersink depth between pilot-hole diameter and screw-head diameter from included countersink angle.

• Edge Banding Trim Allowance

  Calculate total edge-banding width to trim and the equal amount per face when strip is centered on a panel.